what is x for 7+3x= 25?

this problem is saying 7 plus (3 multiplied by some number) equals 25. to find x, you perform the Opposite operation than what is showing in the problem:
if its addition, you use subtraction & vice versa
if its multiplication, you use division & vice versa

When you perform one operation on one side of the equal sign, you do it the other side of the equal sign...
7 + 3x = 25
since the 7 is positive (+) the opposite of addition is subtraction, subtract 7 from both sides & it leaves you with:
3x = 18
since whats left is 3 multiplied by some number, the opposite is division, divide by 3 on both sides:
x = 6

check it: to make sure its correct, plug in your value for "x" into the equation:
7 + 3x = 25
7 + 3(6) = 25
3 * 6 = 18 so...
7 + 18 = 25
25 = 25

7+3x= 25

3x = 25 - 7

3x = 18

x = 18 / 3

x = 6

3x = 18

x = 6

x = 6.

7 + 3x = 25
3x = 25 - 7
x = 18/3
x = 6

x= the devils number if he were a hockey player 6

7+3x=25
3x=25-7
3x=18
x=6

x=6